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9 spd rear derailleurs

Old 09-15-13, 10:07 AM
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byrd48
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9 spd rear derailleurs

Hi,
I'm looking for a new 9spd rear derailleur for a bike I just purchased (old mtn bike I'm upgrading to 9spd). I have another bike I upgraded and I used a Shimano m591, which has worked fine in the 2000 miles I've put on it. I would like for it to shift a bit quicker on the larger cogs, but with a wide range and 3 chainrings up front, I know it's not going to shift as quickly as a road bike. So I'm content to get another m591 for the new bike, but I was looking at the m662 and m772 shadow type models, which are about 50% more expensive. I do 100% commuting and touring if that makes a difference, so in terms of the shadow, I don't really need the clearance for rocks, stumps, etc. Does anyone have experience with the m591 and either the m662 or m772? Other than the profile, would there be any performance increase with the more expensive models? I've read that they possibly reduce chain slap, which I haven't had a problem with anyway to date.
Thanks in advance,
Jon
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Old 09-15-13, 10:12 AM
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Bill Kapaun
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Is your "B" screw properly set?
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Old 09-15-13, 10:19 AM
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byrd48
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I think so, the pulley rides almost on the teeth in the large cogs, which is where it should be as I understand it. It's not that bad, but when you downshift from the largest two cogs, there is maybe a second delay before the shift completes.
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Old 09-15-13, 10:20 AM
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If you are looking to get a quicker response from the rear derailleur, would be looking at replacing the inner & outer gear cables before the derailleur. These will determine (along with the cable routing which you normally can't change) how well it shifts. you may get some improvement if going for a combination of shifter and derailleur upgrade, but less so if looking just at the derailleur.

For Shadow vs non-Shadow, having used both; off road would always go with Shadow, for on road as you are using, would look at the which ever was the cheapest option.

For the reduction in chain slap you mention, this is possible when using Shadow+ derailleur, however, these only come in 10 speed (Dynasys for Shimano) and are not 9 speed compatible.
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Old 09-15-13, 11:30 AM
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Thanks,
I use Dura Ace bar end shifters, which according to the paperwork that came with them, they say only use Dura Ace derailleurs. I've always thought the derailleur doesn't really care what is shifting it, as long as it can accommodate the chain wrap, which this one clearly can, but maybe they do have something with the dura ace system that is more finely tuned? The cables and housing are all new.
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